>>23556203>lay eggsYes, as all Pokemon do.
>scaleyNot even all Pokemon in the dragon breeding group are scaly, and even mammals and birds have scales. Feathers and fur are highly modified and adapted scales.
>cold bloodedLook up what ectothermy means. In any case, it doesn't matter if dragons are reptilian or not, considering clade Reptilia doesn't exist in the Pokemon world and tiny bat-dragons can breed with birds but not other mammal-like Pokemon.